尝试模拟restClient外部API，但它正在使用Java中的实际API

Question

我正在尝试模拟restClient外部API，但它正在调用实际的API，而不是模拟它。请帮助，因为我不确定我要去哪里哪里。

我尝试模拟通话和其他一些操作，但是没有用。

public class TestService
{
    private static final String EXTERNAL_API = "http://LinktoExternalAPI/";

    @Autowired
    RestTemplate restTemplate;


    public  Map<String, String> countryCodes()
    {
        Map<String, String> map = new TreeMap<>();

        try
        {
            ResponseEntity<testCountry[]> responseEntity = restTemplate
                    .getForEntity(EXTERNAL_API
                            , testCountry[].class);
            List<testCountry> testCountryList = Arrays.asList(responseEntity.getBody());
            map = testCountryList.stream()
                    .collect(Collectors.toMap(testCountry::getCode, testCountry::getName));
        }

        catch (HttpClientErrorException | HttpServerErrorException httpClientOrServerExc)
        {

        }

        return map;
    }
}

下面的测试用例：

@RunWith(PowerMockRunner.class)
public class TestServiceTest
{
    @InjectMocks
    TestService testService;

    @Mock
    RestTemplate restTemplate;

    private static final String EXTERNAL_API = "http://LinktoExternalAPI/";

    @Test
    public void testCountryCodes(){

        TestCountry testCountry = new TestCountry();
        testCountry.setCode("JPN");
        testCountry.setName("Japan");

        List<testCountry> testCountryList = new ArrayList<testCountry>();
        testCountryList.add(testCountry);

        Mockito.when(restTemplate.getForEntity(EXTERNAL_API, testCountry[].class)).thenReturn(new ResponseEntity(testCountryList, HttpStatus.OK));
        Map<String, String> result = testService.countryCodes();

        // result is pulling the actual size of the api instead of mocking and sending me testCountryList size.
        <Will mention assertion here>
    }

结果是拉出API的实际大小，而不是模拟并发送给我testCountryList大小。

Answer 1

调用实际API的原因可能是您要模拟的URL与运行时生成的URL不完全相同，因此找不到模拟并调用实际的API。在这种情况下，可以使用Mockito.any()。

所以模拟代码将为Mockito.when(restTemplate.getForEntity(Mockito.any(), Mockito.any())).thenReturn(new ResponseEntity(testCountryList, HttpStatus.OK));

@RunWith(MockitoJUnitRunner.class)
public class TestServiceTest {

  @InjectMocks
  private TestService testService;

  @Mock
  private RestTemplate restTemplate;

  @Test
  public void testCountryCodes(){

    TestCountry testCountry = new TestCountry();
    testCountry.setCode("JPN");
    testCountry.setName("Japan");

    TestCountry[] testCountryList = {
        testCountry
    };

    Mockito.when(restTemplate.getForEntity(Mockito.anyString(), Mockito.any())).thenReturn(new ResponseEntity(testCountryList, HttpStatus.OK));

    Map<String, String> result = testService.countryCodes();

    // result is pulling the actual size of the API instead of mocking and sending me testCountryList size.

  }
}

也尝试使用@RunWith(MockitoJUnitRunner.class)而不是PowerMockRunner.class，因为您似乎不需要PowerMock功能。

Answer 2

您在嘲笑错误的方法定义。

您需要定义this方法的行为。

this

有关更完整的示例，请查看我的答案Mockito.when(api.getForObject(any(String.class),any(Class.class), ArgumentMatchers.<Object>any())).thenReturn(obj1); 。